过电位
催化作用
电化学
材料科学
化学工程
电催化剂
纳米技术
纳米结构
金属
贵金属
氢
析氧
分解水
化学
电极
冶金
物理化学
有机化学
生物化学
光催化
工程类
作者
Avraham Bar-Hen,Ronen Bar‐Ziv,Tsion Ohaion-Raz,Amir Mizrahi,Simon Hettler,Raúl Arenal,Maya Bar‐Sadan
标识
DOI:10.1016/j.cej.2021.129771
摘要
The development of noble-metal free electrocatalysts is of high importance for clean energy conversion applications. MoS$_2$ has been considered as a promising low cost catalyst for the hydrogen evolution reaction (HER), however its activity is limited by poor conductivity and low abundance of active sites. Moreover, its suitability as an effective catalyst for other reactions, in particluar the oxygen reduction reaction (ORR), was hardly explored to date. Herein, we show hybrid nanostructures of shelled CuS particles with MoS$_2$ layers, which produces several outcomes: The MoS$_2$ shell is strained and defective, and charge transfer from the core to MoS$_2$ occurs, enabling activation of the basal plane of MoS$_2$. Changing the feed ratio of the precursors led to control over morphology, such that the wrapping of the cores with the shell was continuously varied and characterized. We found an optimal hybrid structure, which provided high electrochemical active surface area and fast charge transfer kinetics, leading to improved activity not only towards HER (overpotential of 225 mV at 10 mA cm$^{-1}$), but also for the sluggish ORR (onset potential 0.87 V vs RHE).
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